RFR(xxs): 8213017: jspawnhelper: need to handle pipe write failure when sending return code

[Alan Bateman]

On 27/10/2018 16:58, Thomas Stüfe wrote:
> May I please have reviews for this trivial patch?
>
> On Linux, I get compiler warnings when building the jspawnhelper. It
> complains about not checking the return code to write when
> communicating an error code back to be parent.
>
> I decided to just fix it since this is indeed a bug. But there is no
> real way to produce error output since stdout/err are redirected. So I
> decided to just exit with a clear error code instead.
>
> bug: https://bugs.openjdk.java.net/browse/JDK-8213017
> cr: http://cr.openjdk.java.net/~stuefe/webrevs/8213017-jspawnhelper-write-return-
> code/webrev_0/webrev/
>
I think this is okay to keep the compiler happy.

-Alan.