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[1/3] kselftest: Add a ksft_perror() helper

Message ID 20230927-ktap-posix-timers-v1-1-399de1cbfbea@kernel.org
State Accepted
Commit 907f33028871fa7c9a3db1efd467b78ef82cce20
Headers show
Series selftests: timers: Convert some more of the timers tests to KTAP | expand

Commit Message

Mark Brown Sept. 27, 2023, 10:18 a.m. UTC 
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@kernel.org>
---
 tools/testing/selftests/kselftest.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
diff mbox series

Patch

diff --git a/tools/testing/selftests/kselftest.h b/tools/testing/selftests/kselftest.h
index 529d29a35900..af9f1202d423 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>
 #endif
 
@@ -155,6 +156,19 @@  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;