Argument processing is specific to the test harness code. Any optional
information needs to be passed via environment variables. Move alternate
path to the RTC_DEV environment variable. Also do not open-code
TEST_HARNESS_MAIN because its definition may change.

Additionally, setup checking can be done in the FIXTURE_SETUP(). With
this adjustment, also improve the error reporting when the device cannot
be opened.

Signed-off-by: Kees Cook <keesc...@chromium.org>
---
Cc: Alexandre Belloni <alexandre.bell...@bootlin.com>
Cc: Shuah Khan <sh...@kernel.org>
Cc: Masahiro Yamada <masahi...@kernel.org>
Cc: linux-...@vger.kernel.org
Cc: linux-kselftest@vger.kernel.org
---
 tools/testing/selftests/rtc/Makefile  |  2 +-
 tools/testing/selftests/rtc/rtctest.c | 66 +++++----------------------
 2 files changed, 13 insertions(+), 55 deletions(-)

diff --git a/tools/testing/selftests/rtc/Makefile 
b/tools/testing/selftests/rtc/Makefile
index 55198ecc04db..654f9d58da3c 100644
--- a/tools/testing/selftests/rtc/Makefile
+++ b/tools/testing/selftests/rtc/Makefile
@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
-CFLAGS += -O3 -Wl,-no-as-needed -Wall
+CFLAGS += -O3 -Wl,-no-as-needed -Wall $(KHDR_INCLUDES)
 LDLIBS += -lrt -lpthread -lm
 
 TEST_GEN_PROGS = rtctest
diff --git a/tools/testing/selftests/rtc/rtctest.c 
b/tools/testing/selftests/rtc/rtctest.c
index 63ce02d1d5cc..41cfefcc20e1 100644
--- a/tools/testing/selftests/rtc/rtctest.c
+++ b/tools/testing/selftests/rtc/rtctest.c
@@ -30,7 +30,18 @@ FIXTURE(rtc) {
 };
 
 FIXTURE_SETUP(rtc) {
+       char *alternate = getenv("RTC_DEV");
+
+       if (alternate)
+               rtc_file = alternate;
+
        self->fd = open(rtc_file, O_RDONLY);
+
+       if (self->fd == -1 && errno == ENOENT)
+               SKIP(return, "Skipping test since %s does not exist", rtc_file);
+       EXPECT_NE(-1, self->fd) {
+               TH_LOG("%s: %s\n", rtc_file, strerror(errno));
+       }
 }
 
 FIXTURE_TEARDOWN(rtc) {
@@ -41,10 +52,6 @@ TEST_F(rtc, date_read) {
        int rc;
        struct rtc_time rtc_tm;
 
-       if (self->fd == -1 && errno == ENOENT)
-               SKIP(return, "Skipping test since %s does not exist", rtc_file);
-       ASSERT_NE(-1, self->fd);
-
        /* Read the RTC time/date */
        rc = ioctl(self->fd, RTC_RD_TIME, &rtc_tm);
        ASSERT_NE(-1, rc);
@@ -88,10 +95,6 @@ TEST_F_TIMEOUT(rtc, date_read_loop, READ_LOOP_DURATION_SEC + 
2) {
        struct rtc_time rtc_tm;
        time_t start_rtc_read, prev_rtc_read;
 
-       if (self->fd == -1 && errno == ENOENT)
-               SKIP(return, "Skipping test since %s does not exist", rtc_file);
-       ASSERT_NE(-1, self->fd);
-
        TH_LOG("Continuously reading RTC time for %ds (with %dms breaks after 
every read).",
               READ_LOOP_DURATION_SEC, READ_LOOP_SLEEP_MS);
 
@@ -126,10 +129,6 @@ TEST_F_TIMEOUT(rtc, uie_read, NUM_UIE + 2) {
        int i, rc, irq = 0;
        unsigned long data;
 
-       if (self->fd == -1 && errno == ENOENT)
-               SKIP(return, "Skipping test since %s does not exist", rtc_file);
-       ASSERT_NE(-1, self->fd);
-
        /* Turn on update interrupts */
        rc = ioctl(self->fd, RTC_UIE_ON, 0);
        if (rc == -1) {
@@ -155,10 +154,6 @@ TEST_F(rtc, uie_select) {
        int i, rc, irq = 0;
        unsigned long data;
 
-       if (self->fd == -1 && errno == ENOENT)
-               SKIP(return, "Skipping test since %s does not exist", rtc_file);
-       ASSERT_NE(-1, self->fd);
-
        /* Turn on update interrupts */
        rc = ioctl(self->fd, RTC_UIE_ON, 0);
        if (rc == -1) {
@@ -198,10 +193,6 @@ TEST_F(rtc, alarm_alm_set) {
        time_t secs, new;
        int rc;
 
-       if (self->fd == -1 && errno == ENOENT)
-               SKIP(return, "Skipping test since %s does not exist", rtc_file);
-       ASSERT_NE(-1, self->fd);
-
        rc = ioctl(self->fd, RTC_RD_TIME, &tm);
        ASSERT_NE(-1, rc);
 
@@ -256,10 +247,6 @@ TEST_F(rtc, alarm_wkalm_set) {
        time_t secs, new;
        int rc;
 
-       if (self->fd == -1 && errno == ENOENT)
-               SKIP(return, "Skipping test since %s does not exist", rtc_file);
-       ASSERT_NE(-1, self->fd);
-
        rc = ioctl(self->fd, RTC_RD_TIME, &alarm.time);
        ASSERT_NE(-1, rc);
 
@@ -308,10 +295,6 @@ TEST_F_TIMEOUT(rtc, alarm_alm_set_minute, 65) {
        time_t secs, new;
        int rc;
 
-       if (self->fd == -1 && errno == ENOENT)
-               SKIP(return, "Skipping test since %s does not exist", rtc_file);
-       ASSERT_NE(-1, self->fd);
-
        rc = ioctl(self->fd, RTC_RD_TIME, &tm);
        ASSERT_NE(-1, rc);
 
@@ -366,10 +349,6 @@ TEST_F_TIMEOUT(rtc, alarm_wkalm_set_minute, 65) {
        time_t secs, new;
        int rc;
 
-       if (self->fd == -1 && errno == ENOENT)
-               SKIP(return, "Skipping test since %s does not exist", rtc_file);
-       ASSERT_NE(-1, self->fd);
-
        rc = ioctl(self->fd, RTC_RD_TIME, &alarm.time);
        ASSERT_NE(-1, rc);
 
@@ -410,25 +389,4 @@ TEST_F_TIMEOUT(rtc, alarm_wkalm_set_minute, 65) {
        ASSERT_EQ(new, secs);
 }
 
-static void __attribute__((constructor))
-__constructor_order_last(void)
-{
-       if (!__constructor_order)
-               __constructor_order = _CONSTRUCTOR_ORDER_BACKWARD;
-}
-
-int main(int argc, char **argv)
-{
-       switch (argc) {
-       case 2:
-               rtc_file = argv[1];
-               /* FALLTHROUGH */
-       case 1:
-               break;
-       default:
-               fprintf(stderr, "usage: %s [rtcdev]\n", argv[0]);
-               return 1;
-       }
-
-       return test_harness_run(argc, argv);
-}
+TEST_HARNESS_MAIN
-- 
2.34.1


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