Hi,
On Tue, Jan 17, 2017 at 09:35:54AM +0000, Kohl, Burkhard wrote:
> Dear All,
>
> I like to propose a change to strace version 4.15 that re-enacts the
> currently hidden -z option for output filtering ("print successful syscalls
> only").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/ > Please find attached a patch file against 4.15 release that implements a > staging approach, i.e. builds output in memory but prints successful syscalls > only when the -z option was given on the cmdline. The implementation is based > on the STDIO library function open_memstream(); since it might not be > available all every target system, respective code sections were guarded with > "#ifdef _GNU_SOURCE" directives. To apply the patchfile: The use of AC_USE_SYSTEM_EXTENSIONS macro results to _GNU_SOURCE being defined unconditionally, so all _GNU_SOURCE checks are useless. If you need to make some code conditional depending on open_memstream availability, add this name to AC_CHECK_FUNCS and check for HAVE_OPEN_MEMSTREAM. > cd strace-4.15 > patch -p1 <strace-4.15i1.patch > > > 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? > Note 2: automake would not run on my system, therefore the patch has both > Makefile.in and Makefile.am. The latter was not tested. There are no known issues with bootstrap script, please use it instead of running automake manually. -- ldv
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