8226242 : Diagnostic output for posix_spawn failure

[Thomas Stüfe]

Hi Roger,

I think this is fine.

Could you please also print out WIFEXITED and WIFSIGNALLED? Since I am not
sure if the WEXITSTATUS contains valid info if WIFEXITED is 0, or just
random noise. Same for WTERMSIG.

Alternatively:
if (WIFEXITED) print("exited normaly with %d", WEXITSTATUS)
else if (WIFSTOPPED) print("terminated with signal %d", WTERMSIG)
...

I am curious what what will print. If the "posix_spawn exec failed" message
was correct we will see WIFEXITED=1 and WEXITSTATUS=127. But if my patch is
wrong and it gave a false positive - maybe the child process run through
just fine and this is just a fluke in communicating with the parent - we
see something different.

Thanks, Thomas


On Mon, Jun 17, 2019 at 7:19 PM Roger Riggs <Roger.Riggs at oracle.com> wrote:

> Hi Thomas,
>
> yes, I meant WTERMSIG.  I figured the useful info was the value of those
> two fields of the status
> but a bit easier to read than the hex formatted value.
> If there is any other information available at that point of execution,
> let me know.
>
> Thanks, Roger
>
> [1]
> http://cr.openjdk.java.net/~rriggs/webrev-spawn-diag-8225192-1/index.html
>
> On 6/17/19 1:08 PM, Thomas Stüfe wrote:
>
> Hi Roger,
>
> thanks for taking care of this!
>
> I think WIFSIGNALED is just a bool though; to get the terminating signal,
> you need to use WTERMSIG. Strictly speaking, WEXISTSTATUS is only valid if
> WIFEXITED!=0 and WTERMSIG only if WIFSIGNALLED!=0; I think they are
> undefined otherwise.
>
>
> They are undefined, yet still extract the values from the status return
> from waitpid.
>
>
> Cheers, Thoams
>
>
>
> On Mon, Jun 17, 2019 at 6:04 PM Roger Riggs <Roger.Riggs at oracle.com>
> wrote:
>
>> Please review adding diagnostic information to the native code handing
>> failures
>> to exec the jspawnhelper.  Some information about the child process
>> status can be included.
>>
>> Jira:
>>    diag task: https://bugs.openjdk.java.net/browse/JDK-8226242
>>    Issue:  https://bugs.openjdk.java.net/browse/JDK-8226192
>>
>> Webrev:
>>    http://cr.openjdk.java.net/~rriggs/webrev-spawn-diag-8225192/
>>
>> Thanks, Roger
>>
>
>