linux-kernel - [PATCH 3/5] selftests: openat2: Print also errno in failure messages

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Date:   Wed, 26 Jan 2022 10:27:21 +0000
From:   Cristian Marussi <cristian.marussi@....com>
To:     linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     shuah@...nel.org, Cristian Marussi <cristian.marussi@....com>,
        Aleksa Sarai <cyphar@...har.com>
Subject: [PATCH 3/5] 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@...har.com>
Signed-off-by: Cristian Marussi <cristian.marussi@....com>
---
 tools/testing/selftests/openat2/helpers.h | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/openat2/helpers.h b/tools/testing/selftests/openat2/helpers.h
index a6ea27344db2..ad5d0ba5b6ce 100644
--- 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__)
-- 
2.17.1