linux-kernel - [PATCH] kselftest: Add a ksft

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Message-ID: <20240430004909.425336-1-edliaw@google.com>
Date: Tue, 30 Apr 2024 00:49:08 +0000
From: Edward Liaw <edliaw@...gle.com>
To: stable@...r.kernel.org, Shuah Khan <shuah@...nel.org>
Cc: kernel-team@...roid.com, Mark Brown <broonie@...nel.org>, 
	Kees Cook <keescook@...omium.org>, Shuah Khan <skhan@...uxfoundation.org>, 
	Edward Liaw <edliaw@...gle.com>, linux-kselftest@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: [PATCH] kselftest: Add a ksft_perror() helper

From: Mark Brown <broonie@...nel.org>

[ Upstream commit 907f33028871fa7c9a3db1efd467b78ef82cce20 ]

The standard library perror() function provides a convenient way to print
an error message based on the current errno but this doesn't play nicely
with KTAP output. Provide a helper which does an equivalent thing in a KTAP
compatible format.

nolibc doesn't have a strerror() and adding the table of strings required
doesn't seem like a good fit for what it's trying to do so when we're using
that only print the errno.

Signed-off-by: Mark Brown <broonie@...nel.org>
Reviewed-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
Stable-dep-of: 071af0c9e582 ("selftests: timers: Convert posix_timers test to generate KTAP output")
Signed-off-by: Edward Liaw <edliaw@...gle.com>
---
 tools/testing/selftests/kselftest.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/tools/testing/selftests/kselftest.h b/tools/testing/selftests/kselftest.h
index e8eecbc83a60..ad7b97e16f37 100644
--- a/tools/testing/selftests/kselftest.h
+++ b/tools/testing/selftests/kselftest.h
@@ -48,6 +48,7 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <stdarg.h>
+#include <string.h>
 #include <stdio.h>
 #include <sys/utsname.h>
 #endif
@@ -156,6 +157,19 @@ static inline void ksft_print_msg(const char *msg, ...)
 	va_end(args);
 }
 
+static inline void ksft_perror(const char *msg)
+{
+#ifndef NOLIBC
+	ksft_print_msg("%s: %s (%d)\n", msg, strerror(errno), errno);
+#else
+	/*
+	 * nolibc doesn't provide strerror() and it seems
+	 * inappropriate to add one, just print the errno.
+	 */
+	ksft_print_msg("%s: %d)\n", msg, errno);
+#endif
+}
+
 static inline void ksft_test_result_pass(const char *msg, ...)
 {
 	int saved_errno = errno;
-- 
2.44.0.769.g3c40516874-goog