Use kselftest_harness.h to simplify the code structure by eliminating conditional logic. Enhance diagnostics by directly printing relevant info, such as access and modification times, upon test failure. Reflecting common I/O optimizations, the access time usually remains unchanged, while the modify time is expected to update. Accordingly, these elements have been logically separated.

Signed-off-by: Shengyu Li shengyu.li.evgeny@gmail.com ---

v3: Explain the need for refactoring v2: Fixed the last Assert --- .../testing/selftests/tty/tty_tstamp_update.c | 49 +++++++++---------- 1 file changed, 22 insertions(+), 27 deletions(-)

diff --git a/tools/testing/selftests/tty/tty_tstamp_update.c b/tools/testing/selftests/tty/tty_tstamp_update.c index 0ee97943dccc..38de211e0715 100644 --- a/tools/testing/selftests/tty/tty_tstamp_update.c +++ b/tools/testing/selftests/tty/tty_tstamp_update.c @@ -9,7 +9,7 @@ #include <unistd.h> #include <linux/limits.h>

-#include "../kselftest.h" +#include "../kselftest_harness.h"

#define MIN_TTY_PATH_LEN 8

@@ -42,47 +42,42 @@ static int write_dev_tty(void) return r; }

-int main(int argc, char **argv) +TEST(tty_tstamp_update) { int r; char tty[PATH_MAX] = {}; struct stat st1, st2;

- ksft_print_header(); - ksft_set_plan(1); + ASSERT_GE(readlink("/proc/self/fd/0", tty, PATH_MAX), 0) + TH_LOG("readlink on /proc/self/fd/0 failed: %m");

- 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 (!tty_valid(tty)) - ksft_exit_skip("invalid tty path '%s'\n", tty); + ASSERT_TRUE(tty_valid(tty)) { + TH_LOG("SKIP: invalid tty path '%s'", tty); + _exit(KSFT_SKIP); + }

- r = stat(tty, &st1); - if (r < 0) - ksft_exit_fail_msg("stat failed on tty path '%s': %m\n", tty); + ASSERT_GE(stat(tty, &st1), 0) + TH_LOG("stat failed on tty path '%s': %m", tty);

/* 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/?i... */ sleep(10);

r = write_dev_tty(); - if (r < 0) - ksft_exit_fail_msg("failed to write to /dev/tty: %s\n", - strerror(-r)); + ASSERT_GE(r, 0) + TH_LOG("failed to write to /dev/tty: %s", strerror(-r));

- r = stat(tty, &st2); - if (r < 0) - ksft_exit_fail_msg("stat failed on tty path '%s': %m\n", tty); + ASSERT_GE(stat(tty, &st2), 0) + TH_LOG("stat failed on tty path '%s': %m", tty); + + /* Validate unchanged atime under 'relatime' to ensure minimal disk I/O */ + EXPECT_EQ(st1.st_atim.tv_sec, st2.st_atim.tv_sec);

/* 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(); - } + ASSERT_NE(st1.st_mtim.tv_sec, st2.st_mtim.tv_sec) + TH_LOG("tty timestamps not updated");

- ksft_test_result_pass( - "timestamps of terminal '%s' updated after write to /dev/tty\n", tty); - return EXIT_SUCCESS; + TH_LOG("timestamps of terminal '%s' updated after write to /dev/tty", + tty); } +TEST_HARNESS_MAIN