Refactor setresgit04 test

Simplify the overall structure using newest LTP API.

Link: https://lore.kernel.org/ltp/[email protected]/
Reviewed-by: Petr Vorel <[email protected]>
Signed-off-by: Andrea Cervesato <[email protected]>
[ pvorel: setresgid(...) => SETRESGID(...) to keep check for 16-bit support ]
Signed-off-by: Petr Vorel <[email protected]>

testcases/kernel/syscalls/setresgid/setresgid04.c

@@ -1,101 +1,47 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) 2014 Fujitsu Ltd.
- * Author: Zeng Linggang <[email protected]>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of version 2 of the GNU General Public License as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it would be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * Copyright (c) Zeng Linggang <[email protected]>
+ * Copyright (C) 2024 SUSE LLC Andrea Cervesato <[email protected]>
  */
-/*
- * Test Description:
- *  Verify that,
- *	File system GID is always set to the same value as the (possibly new)
- *	effective GID.
+
+/*\
+ * [Description]
+ *
+ * Verify that setresgid() syscall always sets the file system GID to the same
+ * value as the new effective GID.
  */
 
 #define _GNU_SOURCE
 
-#include <errno.h>
-#include <unistd.h>
 #include <pwd.h>
-#include <sys/stat.h>
-#include "test.h"
-#include "safe_macros.h"
-#include "compat_16.h"
+#include "tst_test.h"
+#include "compat_tst_16.h"
 
-TCID_DEFINE(setresgid04);
-int TST_TOTAL = 1;
 static struct passwd *ltpuser;
-static void setup(void);
-static void setresgid_verify(void);
-static void cleanup(void);
 
-int main(int argc, char **argv)
+static void run(void)
 {
-	int i, lc;
-
-	tst_parse_opts(argc, argv, NULL, NULL);
+	struct stat buf;
 
-	setup();
+	TST_EXP_PASS(SETRESGID(-1, ltpuser->pw_gid, -1));
 
-	for (lc = 0; TEST_LOOPING(lc); lc++) {
-		tst_count = 0;
-		for (i = 0; i < TST_TOTAL; i++)
-			setresgid_verify();
-	}
+	SAFE_TOUCH("test_file", 0644, NULL);
+	SAFE_STAT("test_file", &buf);
 
-	cleanup();
-	tst_exit();
+	TST_EXP_EQ_LI(ltpuser->pw_gid, buf.st_gid);
 }
 
 static void setup(void)
 {
-	tst_require_root();
-
-	tst_sig(NOFORK, DEF_HANDLER, cleanup);
-
-	TEST_PAUSE;
-
-	tst_tmpdir();
-
-	ltpuser = SAFE_GETPWNAM(cleanup, "nobody");
+	ltpuser = SAFE_GETPWNAM("nobody");
 
-	GID16_CHECK(ltpuser->pw_gid, "setresgid", cleanup)
+	GID16_CHECK(ltpuser->pw_gid, "setresgid");
 }
 
-static void setresgid_verify(void)
-{
-	struct stat buf;
-
-	TEST(SETRESGID(cleanup, -1, ltpuser->pw_gid, -1));
-
-	if (TEST_RETURN != 0) {
-		tst_resm(TFAIL | TTERRNO, "setresgid failed unexpectedly");
-		return;
-	}
-
-	SAFE_TOUCH(cleanup, "test_file", 0644, NULL);
-
-	SAFE_STAT(cleanup, "test_file", &buf);
-
-	if (ltpuser->pw_gid == buf.st_gid) {
-		tst_resm(TPASS, "setresgid succeeded as expected");
-	} else {
-		tst_resm(TFAIL,
-			 "setresgid failed unexpectedly; egid(%d) - st_gid(%d)",
-			 ltpuser->pw_gid, buf.st_gid);
-	}
-}
-
-static void cleanup(void)
-{
-	tst_rmdir();
-}
+static struct tst_test test = {
+	.test_all = run,
+	.setup = setup,
+	.needs_root = 1,
+	.needs_tmpdir = 1,
+};