From: Mark Brown broonie@kernel.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@kernel.org Reviewed-by: Kees Cook keescook@chromium.org Signed-off-by: Shuah Khan skhan@linuxfoundation.org Stable-dep-of: 071af0c9e582 ("selftests: timers: Convert posix_timers test to generate KTAP output") Signed-off-by: Edward Liaw edliaw@google.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;