Re: [Qemu-devel] [RFC PATCH] tests: use g_test_trap_fork for glib between 2.16 and 2.38

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

On Tue, Sep 16, 2014 at 05:43:24PM +0200, Paolo Bonzini wrote:
> Glib recently introduced a robust way to run tests in a subprocess,
> which is used in test-qdev-global-props.  However, we would like
> to have the same tests run with older versions of glib, and the
> older fork-based mechanisms works well enough.
> 
> This still requires:
> 
> - bumping the minimum required version from 2.12 to 2.16.  I suggest
> bumping to the currently required version for Windows, which is 2.20
> (released March 2009).
> 
> - disabling the test on Windows, since it does not have fork

Right but it could work on windows if glib is new enough?
Why disable there?

> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
>  tests/Makefile                 |  2 +-
>  tests/test-qdev-global-props.c | 63 +++++++++++++++++++++++++++---------------
>  2 files changed, 41 insertions(+), 24 deletions(-)
> 
> diff --git a/tests/Makefile b/tests/Makefile
> index d5db97b..7f125e8 100644
> --- a/tests/Makefile
> +++ b/tests/Makefile
> @@ -58,7 +58,7 @@ check-unit-y += tests/test-int128$(EXESUF)
>  # all code tested by test-int128 is inside int128.h
>  gcov-files-test-int128-y =
>  check-unit-y += tests/test-bitops$(EXESUF)
> -check-unit-y += tests/test-qdev-global-props$(EXESUF)
> +check-unit-$(CONFIG_POSIX) += tests/test-qdev-global-props$(EXESUF)
>  check-unit-y += tests/check-qom-interface$(EXESUF)
>  gcov-files-check-qom-interface-y = qom/object.c
>  check-unit-$(CONFIG_POSIX) += tests/test-vmstate$(EXESUF)
> diff --git a/tests/test-qdev-global-props.c b/tests/test-qdev-global-props.c
> index 0be9835..8e4b270 100644
> --- a/tests/test-qdev-global-props.c
> +++ b/tests/test-qdev-global-props.c
> @@ -29,6 +29,27 @@
>  #include "qom/object.h"
>  #include "qapi/visitor.h"
>  
> +/* Use the older fork() mechanism if the newer, more robust subprocess tests
> + * are not available.
> + */
> +#if GLIB_CHECK_VERSION(2, 38, 0)
> +# define TEST_ADD_FUNC_SUBPROCESS(name, func) do {               \
> +        g_test_add_func(name "/subprocess", func##_subprocess); \
> +        g_test_add_func(name, func);                            \
> +    } while (0)
> +# define TEST_TRAP_SUBPROCESS(name, func)                        \
> +    g_test_trap_subprocess(name, 0, 0)
> +#else
> +# define TEST_ADD_FUNC_SUBPROCESS(name, func) \
> +    g_test_add_func(name, func)
> +# define TEST_TRAP_SUBPROCESS(name, func) do {                                                \
> +        if (g_test_trap_fork (0, G_TEST_TRAP_SILENCE_STDOUT | G_TEST_TRAP_SILENCE_STDERR)) { \
> +            func();                                                                          \
> +            exit(0);                                                                         \
> +        }                                                                                    \
> +    } while(0)
> +#endif
> +
>

two empty lines.
  
>  #define TYPE_STATIC_PROPS "static_prop_type"
>  #define STATIC_TYPE(obj) \
> @@ -77,7 +98,8 @@ static void test_static_prop_subprocess(void)
>  
>  static void test_static_prop(void)
>  {
> -    g_test_trap_subprocess("/qdev/properties/static/default/subprocess", 0, 0);
> +    TEST_TRAP_SUBPROCESS("/qdev/properties/static/default/subprocess",
> +                         test_static_prop_subprocess);
>      g_test_trap_assert_passed();
>      g_test_trap_assert_stderr("");
>      g_test_trap_assert_stdout("");
> @@ -103,7 +125,8 @@ static void test_static_globalprop_subprocess(void)
>  
>  static void test_static_globalprop(void)
>  {
> -    g_test_trap_subprocess("/qdev/properties/static/global/subprocess", 0, 0);
> +    TEST_TRAP_SUBPROCESS("/qdev/properties/static/global/subprocess",
> +                         test_static_globalprop_subprocess);
>      g_test_trap_assert_passed();
>      g_test_trap_assert_stderr("");
>      g_test_trap_assert_stdout("");
> @@ -235,7 +258,8 @@ static void test_dynamic_globalprop_subprocess(void)
>  
>  static void test_dynamic_globalprop(void)
>  {
> -    g_test_trap_subprocess("/qdev/properties/dynamic/global/subprocess", 0, 0);
> +    TEST_TRAP_SUBPROCESS("/qdev/properties/dynamic/global/subprocess",
> +                         test_dynamic_globalprop_subprocess);
>      g_test_trap_assert_passed();
>      g_test_trap_assert_stderr_unmatched("*prop1*");
>      g_test_trap_assert_stderr_unmatched("*prop2*");
> @@ -280,7 +304,8 @@ static void test_dynamic_globalprop_nouser_subprocess(void)
>  
>  static void test_dynamic_globalprop_nouser(void)
>  {
> -    g_test_trap_subprocess("/qdev/properties/dynamic/global/nouser/subprocess", 0, 0);
> +    TEST_TRAP_SUBPROCESS("/qdev/properties/dynamic/global/nouser/subprocess",
> +                         test_dynamic_globalprop_nouser_subprocess);
>      g_test_trap_assert_passed();
>      g_test_trap_assert_stderr("");
>      g_test_trap_assert_stdout("");
> @@ -297,25 +322,17 @@ int main(int argc, char **argv)
>      type_register_static(&nohotplug_type);
>      type_register_static(&nondevice_type);
>  
> -    g_test_add_func("/qdev/properties/static/default/subprocess",
> -                    test_static_prop_subprocess);
> -    g_test_add_func("/qdev/properties/static/default",
> -                    test_static_prop);
> -
> -    g_test_add_func("/qdev/properties/static/global/subprocess",
> -                    test_static_globalprop_subprocess);
> -    g_test_add_func("/qdev/properties/static/global",
> -                    test_static_globalprop);
> -
> -    g_test_add_func("/qdev/properties/dynamic/global/subprocess",
> -                    test_dynamic_globalprop_subprocess);
> -    g_test_add_func("/qdev/properties/dynamic/global",
> -                    test_dynamic_globalprop);
> -
> -    g_test_add_func("/qdev/properties/dynamic/global/nouser/subprocess",
> -                    test_dynamic_globalprop_nouser_subprocess);
> -    g_test_add_func("/qdev/properties/dynamic/global/nouser",
> -                    test_dynamic_globalprop_nouser);
> +    TEST_ADD_FUNC_SUBPROCESS("/qdev/properties/static/default",
> +                             test_static_prop);
> +
> +    TEST_ADD_FUNC_SUBPROCESS("/qdev/properties/static/global",
> +                             test_static_globalprop);
> +
> +    TEST_ADD_FUNC_SUBPROCESS("/qdev/properties/dynamic/global",
> +                             test_dynamic_globalprop);
> +
> +    TEST_ADD_FUNC_SUBPROCESS("/qdev/properties/dynamic/global/nouser",
> +                             test_dynamic_globalprop_nouser);
>  
>      g_test_run();
>  
> -- 
> 2.1.0