selftests/harness: Switch to TAP output

Using the kselftest_harness.h would result in non-TAP test reporting,
which didn't make much sense given that all the requirements for using
the low-level API were met. Switch to using ksft_*() helpers while
retaining as much of a human-readability as possible.

Signed-off-by: Kees Cook <[e-mail]>
Signed-off-by: Shuah Khan <[e-mail]>

tools/testing/selftests/kselftest.h

···
 /* SPDX-License-Identifier: GPL-2.0 */
 /*
- * kselftest.h:	kselftest framework return codes to include from
- *		selftests.
+ * kselftest.h:	low-level kselftest framework to include from
+ *		selftest programs. When possible, please use
+ *		kselftest_harness.h instead.
  *
  * Copyright (c) 2014 Shuah Khan <[e-mail]>
  * Copyright (c) 2014 Samsung Electronics Co., Ltd.

tools/testing/selftests/kselftest_harness.h

···
 #ifndef __KSELFTEST_HARNESS_H
 #define __KSELFTEST_HARNESS_H
 
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE
+#endif
 #include <asm/types.h>
 #include <errno.h>
 #include <stdbool.h>
···
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <unistd.h>
+
+#include "kselftest.h"
 
 #define TEST_TIMEOUT_DEFAULT 30
 
···
 
 /* Unconditional logger for internal use. */
 #define __TH_LOG(fmt, ...) \
-		fprintf(TH_LOG_STREAM, "%s:%d:%s:" fmt "\n", \
+		fprintf(TH_LOG_STREAM, "# %s:%d:%s:" fmt "\n", \
 			__FILE__, __LINE__, _metadata->name, ##__VA_ARGS__)
 
 /**
···
  */
 #define XFAIL(statement, fmt, ...) do { \
 	if (TH_LOG_ENABLED) { \
-		fprintf(TH_LOG_STREAM, "[  XFAIL!  ] " fmt "\n", \
+		fprintf(TH_LOG_STREAM, "#      XFAIL     " fmt "\n", \
 			##__VA_ARGS__); \
 	} \
 	/* TODO: find a way to pass xfail to test runner process. */ \
···
 	/* Sanity check handler execution environment. */
 	if (!t) {
 		fprintf(TH_LOG_STREAM,
-			"no active test in SIGALRM handler!?\n");
+			"# no active test in SIGALRM handler!?\n");
 		abort();
 	}
 	if (sig != SIGALRM || sig != info->si_signo) {
 		fprintf(TH_LOG_STREAM,
-			"%s: SIGALRM handler caught signal %d!?\n",
+			"# %s: SIGALRM handler caught signal %d!?\n",
 			t->name, sig != SIGALRM ? sig : info->si_signo);
 		abort();
 	}
···
 	if (sigaction(SIGALRM, &action, &saved_action)) {
 		t->passed = 0;
 		fprintf(TH_LOG_STREAM,
-			"%s: unable to install SIGALRM handler\n",
+			"# %s: unable to install SIGALRM handler\n",
 			t->name);
 		return;
 	}
···
 	if (sigaction(SIGALRM, &saved_action, NULL)) {
 		t->passed = 0;
 		fprintf(TH_LOG_STREAM,
-			"%s: unable to uninstall SIGALRM handler\n",
+			"# %s: unable to uninstall SIGALRM handler\n",
 			t->name);
 		return;
 	}
···
 	if (t->timed_out) {
 		t->passed = 0;
 		fprintf(TH_LOG_STREAM,
-			"%s: Test terminated by timeout\n", t->name);
+			"# %s: Test terminated by timeout\n", t->name);
 	} else if (WIFEXITED(status)) {
 		t->passed = t->termsig == -1 ? !WEXITSTATUS(status) : 0;
 		if (t->termsig != -1) {
 			fprintf(TH_LOG_STREAM,
-				"%s: Test exited normally "
-				"instead of by signal (code: %d)\n",
+				"# %s: Test exited normally instead of by signal (code: %d)\n",
 				t->name,
 				WEXITSTATUS(status));
 		} else if (!t->passed) {
 			fprintf(TH_LOG_STREAM,
-				"%s: Test failed at step #%d\n",
+				"# %s: Test failed at step #%d\n",
 				t->name,
 				WEXITSTATUS(status));
 		}
···
 		t->passed = 0;
 		if (WTERMSIG(status) == SIGABRT) {
 			fprintf(TH_LOG_STREAM,
-				"%s: Test terminated by assertion\n",
+				"# %s: Test terminated by assertion\n",
 				t->name);
 		} else if (WTERMSIG(status) == t->termsig) {
 			t->passed = 1;
 		} else {
 			fprintf(TH_LOG_STREAM,
-				"%s: Test terminated unexpectedly "
-				"by signal %d\n",
+				"# %s: Test terminated unexpectedly by signal %d\n",
 				t->name,
 				WTERMSIG(status));
 		}
 	} else {
 		fprintf(TH_LOG_STREAM,
-			"%s: Test ended in some other way [%u]\n",
+			"# %s: Test ended in some other way [%u]\n",
 			t->name,
 			status);
 	}
···
 	t->step = 0;
 	t->no_print = 0;
 
-	printf("[ RUN      ] %s%s%s.%s\n",
+	ksft_print_msg(" RUN           %s%s%s.%s ...\n",
 	       f->name, variant->name[0] ? "." : "", variant->name, t->name);
 	t->pid = fork();
 	if (t->pid < 0) {
-		printf("ERROR SPAWNING TEST CHILD\n");
+		ksft_print_msg("ERROR SPAWNING TEST CHILD\n");
 		t->passed = 0;
 	} else if (t->pid == 0) {
 		t->fn(t, variant);
···
 	} else {
 		__wait_for_test(t);
 	}
-	printf("[     %4s ] %s%s%s.%s\n", (t->passed ? "OK" : "FAIL"),
+	ksft_print_msg("         %4s  %s%s%s.%s\n", t->passed ? "OK" : "FAIL",
+	       f->name, variant->name[0] ? "." : "", variant->name, t->name);
+	ksft_test_result(t->passed, "%s%s%s.%s\n",
 	       f->name, variant->name[0] ? "." : "", variant->name, t->name);
 }
 
···
 		}
 	}
 
-	/* TODO(wad) add optional arguments similar to gtest. */
-	printf("[==========] Running %u tests from %u test cases.\n",
+	ksft_print_header();
+	ksft_set_plan(test_count);
+	ksft_print_msg("Starting %u tests from %u test cases.\n",
 	       test_count, case_count);
 	for (f = __fixture_list; f; f = f->next) {
 		for (v = f->variant ?: &no_variant; v; v = v->next) {
···
 			}
 		}
 	}
-	printf("[==========] %u / %u tests passed.\n", pass_count, count);
-	printf("[  %s  ]\n", (ret ? "FAILED" : "PASSED"));
-	return ret;
+	ksft_print_msg("%s: %u / %u tests passed.\n", ret ? "FAILED" : "PASSED",
+			pass_count, count);
+	ksft_exit(ret == 0);
+
+	/* unreachable */
+	return KSFT_FAIL;
 }
 
 static void __attribute__((constructor)) __constructor_order_first(void)