syscalls/stime: Use 3 variants via test_multiplex()

We will test stime() libc wrapper, __NR_stime and __NR_settimeofday
syscalls.

Note:
1) bionic (Android libc) does not provide stime(), so avoid testing
   it on Android.
2) some arches(e.g. x86_64) don't define __NR_stime directly because
   glibc implements stime() by __NR_settimeofday.

Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
Reviewed-by: Steve Muckle <smuckle@google.com>
Tested-by: Steve Muckle <smuckle@google.com>

3 files changed, 68 insertions, 5 deletions

diff --git a/testcases/kernel/syscalls/stime/stime01.c b/testcases/kernel/syscalls/stime/stime01.c
index 279b0b1b1..82a340258 100644
--- a/testcases/kernel/syscalls/stime/stime01.c
+++ b/testcases/kernel/syscalls/stime/stime01.c
@@ -17,8 +17,8 @@
 #include <time.h>
 #include <sys/time.h>
 
-#include "lapi/syscalls.h"
 #include "tst_test.h"
+#include "stime_var.h"
 
 static struct timeval real_time_tv;
 
@@ -32,7 +32,7 @@ static void run(void)
 
 	new_time = real_time_tv.tv_sec + 30;
 
-	if (tst_syscall(__NR_stime, &new_time) < 0) {
+	if (do_stime(&new_time) < 0) {
 		tst_res(TFAIL | TERRNO, "stime(%ld) failed", new_time);
 		return;
 	}
@@ -52,8 +52,15 @@ static void run(void)
 	}
 }
 
+static void setup(void)
+{
+	stime_info();
+}
+
 static struct tst_test test = {
 	.test_all = run,
 	.needs_root = 1,
 	.restore_wallclock = 1,
+	.setup = setup,
+	.test_variants = TEST_VARIANTS,
 };
diff --git a/testcases/kernel/syscalls/stime/stime02.c b/testcases/kernel/syscalls/stime/stime02.c
index 1aa10212b..126a49ade 100644
--- a/testcases/kernel/syscalls/stime/stime02.c
+++ b/testcases/kernel/syscalls/stime/stime02.c
@@ -19,15 +19,14 @@
 #include <time.h>
 #include <pwd.h>
 
-#include "lapi/syscalls.h"
 #include "tst_test.h"
+#include "stime_var.h"
 
 static time_t new_time;
 
 static void run(void)
 {
-	TEST(tst_syscall(__NR_stime, &new_time));
-
+	TEST(do_stime(&new_time));
 	if (TST_RET != -1) {
 		tst_res(TFAIL,
 			"stime() returned %ld, expected -1 EPERM", TST_RET);
@@ -48,6 +47,8 @@ static void setup(void)
 	time_t curr_time;
 	struct passwd *ltpuser;
 
+	stime_info();
+
 	ltpuser = SAFE_GETPWNAM("nobody");
 	SAFE_SETUID(ltpuser->pw_uid);
 
@@ -61,4 +62,5 @@ static struct tst_test test = {
 	.test_all = run,
 	.setup = setup,
 	.needs_root = 1,
+	.test_variants = TEST_VARIANTS,
 };
diff --git a/testcases/kernel/syscalls/stime/stime_var.h b/testcases/kernel/syscalls/stime/stime_var.h
new file mode 100644
index 000000000..b014f0a10
--- /dev/null
+++ b/testcases/kernel/syscalls/stime/stime_var.h
@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2019 FUJITSU LIMITED. All rights reserved.
+ * Author: Xiao Yang <yangx.jy@cn.fujitsu.com>
+ */
+
+#ifndef STIME_VAR__
+#define STIME_VAR__
+
+#include <sys/time.h>
+#include "lapi/syscalls.h"
+
+#define TEST_VARIANTS 3
+
+static int do_stime(time_t *ntime)
+{
+	switch (tst_variant) {
+	case 0:
+#ifdef __ANDROID__
+		tst_brk(TCONF, "libc stime() is not implemented on Android");
+#else
+		return stime(ntime);
+#endif
+	case 1:
+		return tst_syscall(__NR_stime, ntime);
+	case 2: {
+		struct timeval tv;
+
+		tv.tv_sec = *ntime;
+		tv.tv_usec = 0;
+
+		return tst_syscall(__NR_settimeofday, &tv, (struct timezone *) 0);
+	}
+	}
+
+	return -1;
+}
+
+static void stime_info(void)
+{
+	switch (tst_variant) {
+	case 0:
+		tst_res(TINFO, "Testing libc stime()");
+		break;
+	case 1:
+		tst_res(TINFO, "Testing SYS_stime syscall");
+		break;
+	case 2:
+		tst_res(TINFO, "Testing SYS_settimeofday syscall");
+		break;
+	}
+}
+
+#endif /* STIME_VAR__ */