* what meaning of command function return val
@ 2012-12-04 2:54 张忠山
2012-12-04 7:42 ` Sascha Hauer
0 siblings, 1 reply; 2+ messages in thread
From: 张忠山 @ 2012-12-04 2:54 UTC (permalink / raw)
To: barebox
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?
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zzs
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* Re: what meaning of command function return val
2012-12-04 2:54 what meaning of command function return val 张忠山
@ 2012-12-04 7:42 ` Sascha Hauer
0 siblings, 0 replies; 2+ messages in thread
From: Sascha Hauer @ 2012-12-04 7:42 UTC (permalink / raw)
To: barebox
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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