Re: [Xen-devel] Suggestion: Improve hypercall Interface to get real return value

[George Dunlap <dunlapg@xxxxxxxxx>]

On Wed, Dec 5, 2012 at 6:21 AM, Yanzhang Li <liyz@xxxxxxxxxx> wrote:

Do you think this would be a good modification?
Also, I am curious why the original design didn't do that. Is it a bug or is it designed that way intentionally?
Any suggestions and comments will be highly appreciated.

The reason we just return -1 is because that is the standard practice for Unix system libraries: to return -1 but set the error value in "errno".  I couldn't tell you why Unix does this, but there's an advantage to following standard interfaces, because it reduces the surprise factor, and reduces the amount of information programmers need to keep in their head.

 -George

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