selftests: openat2: Print also errno in failure messages

In E_func() macro, on error, print also errno in order to aid debugging.

Cc: Aleksa Sarai <cyphar@cyphar.com>
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

diff --git a/tools/testing/selftests/openat2/helpers.h b/tools/testing/selftests/openat2/helpers.h
index a6ea273..ad5d0ba 100644 (file)
--- a/tools/testing/selftests/openat2/helpers.h
+++ b/tools/testing/selftests/openat2/helpers.h
@@ -62,11 +62,12 @@ bool needs_openat2(const struct open_how *how);
                                        (similar to chroot(2)). */
 #endif /* RESOLVE_IN_ROOT */
 
-#define E_func(func, ...)                                              \
-       do {                                                            \
-               if (func(__VA_ARGS__) < 0)                              \
-                       ksft_exit_fail_msg("%s:%d %s failed\n", \
-                                          __FILE__, __LINE__, #func);\
+#define E_func(func, ...)                                                    \
+       do {                                                                  \
+               errno = 0;                                                    \
+               if (func(__VA_ARGS__) < 0)                                    \
+                       ksft_exit_fail_msg("%s:%d %s failed - errno:%d\n",    \
+                                          __FILE__, __LINE__, #func, errno); \
        } while (0)
 
 #define E_asprintf(...)                E_func(asprintf,        __VA_ARGS__)