Re: [Xen-devel] [PATCH v1 7/7] tools/livepatch: Exit with 2 if a timeout occurs

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Mon, Dec 12, 2016 at 04:18:10PM +0000, Ross Lagerwall wrote:
> Exit with 0 for success.
> Exit with 1 for an error.
> Exit with 2 if the operation should be retried for any reason (e.g. a
> timeout or because another operation was in progress).
> 
> This allows a program or script driving xen-livepatch to determine if
> the operation should be retried without parsing the output.
> 
> Fix a number of incorrect uses of errno after an operation that could
> set it (e.g. fprintf, close).

This should probably be split out to another patch so that it can be
backported to 4.7 and 4.8?

>      {
> @@ -485,7 +490,24 @@ int main(int argc, char *argv[])
>  
>      xc_interface_close(xch);
>  
> -    return !!ret;
> +    /*
> +     * Exitcode 0 for success.
> +     * Exitcode 1 for an error.
> +     * Exitcode 2 if the operation should be retried for any reason (e.g. a
> +     * timeout or because another operation was in progress).
> +     */
> +
> +#define EXIT_TIMEOUT (EXIT_FAILURE + 1)

I doubt there would be any other value used for EXIT_FAILURE, but to
make sure the code matches the comment, please:

  BUILD_BUG_ON(EXIT_SUCCESS != 0);
  BUILD_BUG_ON(EXIT_FAILURE != 1);


> +    switch ( ret )
> +    {
> +    case 0:
> +        return EXIT_SUCCESS;
> +    case EAGAIN:
> +    case EBUSY:
> +        return EXIT_TIMEOUT;
> +    default:
> +        return EXIT_FAILURE;
> +    }
>  }
>  
>  /*
> -- 
> 2.7.4
> 

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