what meaning of command function return val

[Sascha Hauer]

On Tue, Dec 04, 2012 at 10:54:54AM +0800, 张忠山 wrote:
> When write a command function do_xxx.
> 
> When all right it should return zero.
> 
> But when error, It should return a negtive value or a positive value?
> And what difference between neg-val and pos-val?

Traditionally only positive error values were supported. This was
changed recently so you can return negative error codes now. The
difference is that with negative error values barebox will print
a string representation of the error code. If that's suitable for
your command I suggest to return negative codes.

Sascha

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