Hi

>Thanks.  As strace is developed in git, please rebase your changes to HEAD of 
>strace.git; also please ensure that your patch does not contain irrelevant 
>changes, e.g. changes of indentation.  See also 
>https://sourceforge.net/p/strace/wiki/Guide%20for%20new%20contributors/

Thanks for the pointer. Did run git send-email, see  "[PATCH v2] Implement 
output staging for failed/successful syscalls".
 
>> Note 1: Since the syserror macro (defined in defs.h) does not distinguish 
>> between failed and not-returned, the "exit_group()" syscall will be filtered 
>> as well with -z.
>Is it the desired behavior or known deficiency of new -z option?

Rather a deficiency - to avoid it, either syserror() macro needs to recognize 
specific u_error values for "not-returned" or the field should be initialized 
to 0.

--
Burkhard


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