Re: [PATCH 2/5] bios-tables-test: fix up DIFF generation

["Michael S. Tsirkin" <mst@redhat.com>]

On Wed, Jan 22, 2020 at 10:00:01AM +0100, Laurent Vivier wrote:
> On 22/01/2020 09:05, Michael S. Tsirkin wrote:
> > Turns out it goes to stdout which is suppressed even with V=1.
> > Force DIFF output to stderr to make it visible.
> > 
> > Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> > ---
> >  tests/qtest/bios-tables-test.c | 7 ++++++-
> >  1 file changed, 6 insertions(+), 1 deletion(-)
> > 
> > diff --git a/tests/qtest/bios-tables-test.c b/tests/qtest/bios-tables-test.c
> > index 6b5f24bf62..c8db2839b2 100644
> > --- a/tests/qtest/bios-tables-test.c
> > +++ b/tests/qtest/bios-tables-test.c
> > @@ -463,13 +463,18 @@ static void test_acpi_asl(test_data *data)
> >                          "Actual [asl:%s, aml:%s], Expected [asl:%s, aml:%s].\n",
> >                          exp_sdt->aml, sdt->asl_file, sdt->aml_file,
> >                          exp_sdt->asl_file, exp_sdt->aml_file);
> > +                fflush(stderr);
> >                  if (getenv("V")) {
> >                      const char *diff_cmd = getenv("DIFF");
> >                      if (diff_cmd) {
> > -                        int ret G_GNUC_UNUSED;
> >                          char *diff = g_strdup_printf("%s %s %s", diff_cmd,
> >                              exp_sdt->asl_file, sdt->asl_file);
> > +                        int out = dup(STDOUT_FILENO);
> > +                        int ret G_GNUC_UNUSED;
> > +
> > +                        dup2(STDERR_FILENO, STDOUT_FILENO);
> >                          ret = system(diff) ;
> > +                        dup2(out, STDOUT_FILENO);
> 
> I think you need a "close(out)" here.
> 
> Thanks,
> Laurent

Can't hurt, thanks!