kselftest/tty: Report a consistent test name for the one test we run

Currently the tty_tstamp_update test reports a different exit message
for every path it can exit via. This can be confusing for automated systems
as the string that gets logged is interpreted as a test name so if the test
status changes they can't tell that it's the same test case that was run,
they can see that the overall status of the test program is a failure but
it's not clear that it was running the same test.

Change all the messages that are logged to be diagnostic prints and log the
name of the program as the test name.
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

tools/testing/selftests/tty/tty_tstamp_update.c

@@ -47,42 +47,60 @@ int main(int argc, char **argv)
 	int r;
 	char tty[PATH_MAX] = {};
 	struct stat st1, st2;
+	int result = KSFT_FAIL;
 
 	ksft_print_header();
 	ksft_set_plan(1);
 
 	r = readlink("/proc/self/fd/0", tty, PATH_MAX);
-	if (r < 0)
-		ksft_exit_fail_msg("readlink on /proc/self/fd/0 failed: %m\n");
+	if (r < 0) {
+		ksft_print_msg("readlink on /proc/self/fd/0 failed: %m\n");
+		goto out;
+	}
+
+	if (!tty_valid(tty)) {
+		ksft_print_msg("invalid tty path '%s'\n", tty);
+		result = KSFT_SKIP;
+		goto out;
 
-	if (!tty_valid(tty))
-		ksft_exit_skip("invalid tty path '%s'\n", tty);
+	}
 
 	r = stat(tty, &st1);
-	if (r < 0)
-		ksft_exit_fail_msg("stat failed on tty path '%s': %m\n", tty);
+	if (r < 0) {
+		ksft_print_msg("stat failed on tty path '%s': %m\n", tty);
+		goto out;
+	}
 
 	/* We need to wait at least 8 seconds in order to observe timestamp change */
 	/* https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fbf47635315ab308c9b58a1ea0906e711a9228de */
 	sleep(10);
 
 	r = write_dev_tty();
-	if (r < 0)
-		ksft_exit_fail_msg("failed to write to /dev/tty: %s\n",
-				   strerror(-r));
+	if (r < 0) {
+		ksft_print_msg("failed to write to /dev/tty: %s\n",
+			       strerror(-r));
+		goto out;
+	}
 
 	r = stat(tty, &st2);
-	if (r < 0)
-		ksft_exit_fail_msg("stat failed on tty path '%s': %m\n", tty);
+	if (r < 0) {
+		ksft_print_msg("stat failed on tty path '%s': %m\n", tty);
+		goto out;
+	}
 
 	/* We wrote to the terminal so timestamps should have been updated */
 	if (st1.st_atim.tv_sec == st2.st_atim.tv_sec &&
 	    st1.st_mtim.tv_sec == st2.st_mtim.tv_sec) {
-		ksft_test_result_fail("tty timestamps not updated\n");
-		ksft_exit_fail();
+		ksft_print_msg("tty timestamps not updated\n");
+		goto out;
 	}
 
-	ksft_test_result_pass(
+	ksft_print_msg(
 		"timestamps of terminal '%s' updated after write to /dev/tty\n", tty);
-	return EXIT_SUCCESS;
+	result = KSFT_PASS;
+
+out:
+	ksft_test_result_report(result, "tty_tstamp_update\n");
+
+	ksft_finished();
 }